Improve error message when scanning unsupported client (#3567)

* Update pretty module in Cosmos chain implementation

* Create 3531-fix-3531.md

* Fix tracing level and add debug log for parsing client state

.changelog/unreleased/improvements/ibc-relayer/3531-fix-3531.md

@@ -0,0 +1,2 @@
+- Improve error message when scanning unsupported client
+  ([\#3531](https://github.com/informalsystems/hermes/issues/3531))

crates/relayer/src/chain/cosmos.rs

@@ -13,7 +13,7 @@ use std::{cmp::Ordering, thread};
 use tokio::runtime::Runtime as TokioRuntime;
 use tonic::codegen::http::Uri;
 use tonic::metadata::AsciiMetadataValue;
-use tracing::{error, info, instrument, trace, warn};
+use tracing::{debug, error, info, instrument, trace, warn};
 
 use ibc_proto::cosmos::{
     base::node::v1beta1::ConfigResponse, staking::v1beta1::Params as StakingParams,
@@ -1184,11 +1184,9 @@ impl ChainEndpoint for CosmosSdkChain {
             .filter_map(|cs| {
                 IdentifiedAnyClientState::try_from(cs.clone())
                     .map_err(|e| {
-                        warn!(
-                            "failed to parse client state {}. Error: {}",
-                            PrettyIdentifiedClientState(&cs),
-                            e
-                        )
+                        let (client_type, client_id) = (if let Some(client_state) = &cs.client_state { client_state.type_url.clone() } else { "None".to_string() }, &cs.client_id);
+                        warn!("encountered unsupported client type `{}` while scanning client `{}`, skipping the client", client_type, client_id);
+                        debug!("failed to parse client state {}. Error: {}", PrettyIdentifiedClientState(&cs), e)
                     })
                     .ok()
             })